Note 4 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2019
Impaired Financing Receivable, Related Allowance	$ 9		$ 9		$ 9
Impaired Financing Receivable, Unpaid Principal Balance	1,205		1,205		1,395
Impaired Financing Receivable, Recorded Investment, Total	1,059		1,059		1,189
Impaired Financing Receivable, Average Recorded Investment	887	$ 1,860	968	$ 1,961
Impaired Financing Receivable, Interest Income, Accrual Method	6	14	105	29
Impaired Financing Receivable, Interest Income, Cash Basis Method	6	14	105	29
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Real Estate Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	496		496		580
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	421		421		436
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	244	1,140	303	1,255
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	8	87	19
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	1	8	87	19
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	215		215		221
Impaired Financing Receivable, with Related Allowance, Recorded Investment	217		217		222
Impaired Financing Receivable, Related Allowance	7		7		7
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	218	227	219	229
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	3	4	6	7
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	3	4	6	7
Commercial Portfolio Segment [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	162		162
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	163		163
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment			167	92
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method			5	3
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method			5	3
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance					173
Impaired Financing Receivable, with Related Allowance, Recorded Investment					174
Impaired Financing Receivable, Related Allowance	2		2		2
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	165	113
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	2	2
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	2	2
Residential Portfolio Segment [Member] | Residential Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	42		42		124
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	10		10		93
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	10	97	25	98
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method			7
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method			7
Residential Portfolio Segment [Member] | Residential Real Estate Non-owner Occupied Loans [Member]
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	290		290		297
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	248		248		$ 264
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	250	283	254	287
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method